Extrinsic semiconductors
Intrinsic semiconductors intrinsic extrinsic freeze-out 1/T log 10 (n i) cm-3 GaAs Si Ge 300 K Extrinsic semiconductors At high temperatures, extrinsic semiconductors have the same temperature dependence as intrinsic semiconductors
Lecture 7: Extrinsic semiconductors - Fermi level
F in extrinsic semiconductors In an intrinsic semiconductor, the Fermi level is located close to the center of the band gap Fermi level represents the average work done to remove an electron from the material (work function) and in an intrinsic semiconductor the electron and hole concentration are equal In an extrinsic semiconductor,
Extrinsic Semiconductors
This relationship is valid for both intrinsic and extrinsic semiconductors In an extrinsic semiconductor the increase in one type of carrier (n or p) reduces the concentration of the other through recombination so that the product of the two (n and p) is a constant at a any given temperature
Lecture 6: Extrinsic semiconductors
from intrinsic Si, then the only way to increase carrier concentration is to increase temperature Doping is a method of selectively increasing carrier concentration, by addi-tion of selected impurities to an intrinsic semiconductor This is called an extrinsic semiconductor In any semiconductor at equilibrium, the law
Current in Semiconductor( Intrinsic and Extrinsic)
Discuss about Extrinsic semiconductor and it’s the necessity P Type and N Type semiconductor and their differences 1–3 Current in Semiconductor( Intrinsic and Extrinsic) As we have learned, the electrons in a solid can exist only within prescribed energy bands Each shell corresponds to a
ENEE 313, Spr ’09 Supplement I Intrinsic and Extrinsic
2 Intrinsic and Extrinsic Materials An intrinsic semiconductor is ideally a perfect crystal When an electron in an intrinsic semiconductor gets enough energy, it can go to the conduction band and leave behind a hole This process is called ”electron-hole pair (EHP) creation” For the intrinsic material, since electrons and holes are always
Semiconductor: Types and Band structure What are Semiconductors?
Intrinsic Semiconductor Extrinsic Semiconductor Intrinsic Semiconductor An intrinsic type of semiconductor material is made to be very pure chemically It is made up of only a single type of element Germanium (Ge) and Silicon (Si) are the most common type of intrinsic semiconductor elements They have
Types of Semiconductors
Extrinsic Semiconductor Where as an extrinsic semiconductor is an improved intrinsic semiconductor with a small amount of impurities added by a process, known as doping, which alters the electrical properties of the semiconductor and improves its conductivity Depending on whether the added impurities have “extra”
RELIABILITY AND TESTING
Intrinsic, extrinsic and composite reliability curves for component hazard rate in a field operating environment (after: Jensen F , Electronic Component Reliability, John Wiley & Sons, 1995) 4 2 Reliability in Development Quality and reliability of semiconductor devices are determined to a
Overview • The concept of hole and effective mass • Intrinsic
For some interesting history of semiconductor industry, see 矽晶之火 , by M Riordan and L Hoddeson (at 300K) Ge Si GaAs GaN energy gap (eV) 0 67 (i) 1 11 (i) 1 43 (d) 3 39 (d) lattice type Diamond Diamond Zincblend Wurtzite Basic properties 2 overlapping hcp lattices Overview Hole and effective mass Intrinsic SM Doped SM PN junction
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